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- /* Audio Library for Teensy 3.X
- * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
- *
- * Development of this audio library was funded by PJRC.COM, LLC by sales of
- * Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
- * open source software by purchasing Teensy or other PJRC products.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice, development funding notice, and this permission
- * notice shall be included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
- #ifndef synth_sine_h_
- #define synth_sine_h_
-
- #include <core/Arduino.h>
- #include <core/AudioStream.h>
- #include <arm_math.h>
-
- // TODO: investigate making a high resolution sine wave
- // using Taylor series expansion.
- // http://www.musicdsp.org/showone.php?id=13
-
- class AudioSynthWaveformSine : public AudioStream
- {
- public:
- AudioSynthWaveformSine() : AudioStream(0, NULL), magnitude(16384) {}
- void frequency(float freq) {
- if (freq < 0.0) freq = 0.0;
- else if (freq > AUDIO_SAMPLE_RATE_EXACT/2) freq = AUDIO_SAMPLE_RATE_EXACT/2;
- phase_increment = freq * (4294967296.0 / AUDIO_SAMPLE_RATE_EXACT);
- }
- void phase(float angle) {
- if (angle < 0.0) angle = 0.0;
- else if (angle > 360.0) {
- angle = angle - 360.0;
- if (angle >= 360.0) return;
- }
- phase_accumulator = angle * (4294967296.0 / 360.0);
- }
- void amplitude(float n) {
- if (n < 0) n = 0;
- else if (n > 1.0) n = 1.0;
- magnitude = n * 65536.0;
- }
- virtual void update(void);
- private:
- uint32_t phase_accumulator;
- uint32_t phase_increment;
- int32_t magnitude;
- };
-
-
- class AudioSynthWaveformSineHires : public AudioStream
- {
- public:
- AudioSynthWaveformSineHires() : AudioStream(0, NULL), magnitude(16384) {}
- void frequency(float freq) {
- if (freq < 0.0) freq = 0.0;
- else if (freq > AUDIO_SAMPLE_RATE_EXACT/2) freq = AUDIO_SAMPLE_RATE_EXACT/2;
- phase_increment = freq * (4294967296.0 / AUDIO_SAMPLE_RATE_EXACT);
- }
- void phase(float angle) {
- if (angle < 0.0) angle = 0.0;
- else if (angle > 360.0) {
- angle = angle - 360.0;
- if (angle >= 360.0) return;
- }
- phase_accumulator = angle * (4294967296.0 / 360.0);
- }
- void amplitude(float n) {
- if (n < 0) n = 0;
- else if (n > 1.0) n = 1.0;
- magnitude = n * 65536.0;
- }
- virtual void update(void);
- private:
- uint32_t phase_accumulator;
- uint32_t phase_increment;
- int32_t magnitude;
- };
-
-
- class AudioSynthWaveformSineModulated : public AudioStream
- {
- public:
- AudioSynthWaveformSineModulated() : AudioStream(1, inputQueueArray), magnitude(16384) {}
- // maximum unmodulated carrier frequency is 11025 Hz
- // input = +1.0 doubles carrier
- // input = -1.0 DC output
- void frequency(float freq) {
- if (freq < 0.0) freq = 0.0;
- else if (freq > AUDIO_SAMPLE_RATE_EXACT/4) freq = AUDIO_SAMPLE_RATE_EXACT/4;
- phase_increment = freq * (4294967296.0 / AUDIO_SAMPLE_RATE_EXACT);
- }
- void phase(float angle) {
- if (angle < 0.0) angle = 0.0;
- else if (angle > 360.0) {
- angle = angle - 360.0;
- if (angle >= 360.0) return;
- }
- phase_accumulator = angle * (4294967296.0 / 360.0);
- }
- void amplitude(float n) {
- if (n < 0) n = 0;
- else if (n > 1.0) n = 1.0;
- magnitude = n * 65536.0;
- }
- virtual void update(void);
- private:
- uint32_t phase_accumulator;
- uint32_t phase_increment;
- audio_block_t *inputQueueArray[1];
- int32_t magnitude;
- };
-
-
- #endif
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